The objective of this study was to investigate biomechanical loads on the lumbar spine as a function of working in a confined vertical space, consistent with baggage handling inside the baggage compartment of an airplane. Ten male subjects performed baggage handling tasks using confined (kneeling, sitting) and unconfined (stooping) lifting styles. Dependent measures of torso flexion and three-dimensional spinal loads were assessed with an electromyography-driven biomechanical model. Lifting exertions typical to airline baggage handling posed significant risk to the lumbar spine, regardless of lifting style. Statistically significant differences attributable to lift style (stooping, kneeling, sitting) were not observed for peak compressive, lateral shear, or resultant spinal loads, but lifting while kneeling decreased anterior/posterior (A/P) shear spinal loads relative to stooping (p = 0.02). Collectively, kneeling offers the greatest benefit when lifting in confined spaces because of the ability to keep the torso upright, subsequently reducing shear forces on the lumbar spine.

中文翻译：

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在狭窄的垂直空间内进行脊柱加载和提升。

这项研究的目的是研究在有限的垂直空间内工作时腰椎上的生物力学负荷，这与飞机行李舱内的行李处理一致。十名男性受试者使用局限（跪着，坐着）和局限（弯腰）举重方式执行行李搬运任务。肌电图驱动的生物力学模型评估躯干屈曲和三维脊柱负荷的相关措施。无论采用哪种举重方式，航空行李搬运过程中典型的举重动作都会对腰椎造成很大的风险。对于峰值压缩，侧向剪切或由此产生的脊柱负荷，未观察到因举重方式（弯腰，跪下，坐着）引起的统计学上的显着差异，但跪时抬起相对于弯腰而言，减少了前后脊椎的剪切脊柱负荷（p = 0.02）。总的来说，跪下在有限的空间内举起时最大的好处是，因为能够将躯干保持直立，从而减少了对腰椎的剪切力。